Check out these Add-ins for Windows Desktop Search :
Easily find all Microsoft Outlook MSG (.MSG) files and the contents within. This Add-in allows you to perform a search on all elements of your MSG (.MSG) files including Message Body; Subject; From; From Name; From Address; To Name; To Address; CC Name; CC Address; Doc Title Prefix; Sent Date; Received Date; Primary Date; Conversation ID; Attachment Names and will indicate if an attachment is present within the .MSG. Additionally, content within attachments are indexed and searched.
By downloading this iFilter, Outlook .MSG files will be indexed by Windows Desktop Search when your PC is idle, or when you select to ‘Index Now’. Once the index is updated you can immediately search your .MSG files.
Also check http://support.microsoft.com/?kbid=917402
Easily find your Internet Explorer History files and their contents.This Add-in indexes the history of the web pages you have browsed using Internet Explorer.
Easily search your shared network directories and FAT drive(s) via Windows Desktop Search.Using this Add-in you will have the ability to search your shared network directories and FAT drive(s) via selection in your Windows Desktop Search Advanced Options.